/Engine/Source/Runtime/CoreUObject/Public/UObject/UObjectGlobals.h
Called when new sparse class data has been created (and the base data initialized) for the given class
typedef TMulticastDelegate_ThreeParams< void, [UClass](API\Runtime\CoreUObject\UObject\UClass) *, [UScriptStruct](API\Runtime\CoreUObject\UObject\UScriptStruct) *, void * > FOnPostInitSparseClassData